He looks like a generic bearded middle-aged nature-goer (hunter, birder, fisherman etc.). Unless you knew him personally you would have to use these pics as a field guide all day long as you pass by other people (and likely get beaten up). And it is possible that this is a deliberate disguise (in order to look inconspicious within a generic bearded middle-aged nature-goer flock at the event) of someone who will shave, change clothes and go away with money he got from selling the item. I think the better option is to look for particular binoculars; if they are so costly there aren't likely to be many of them around.